md_eq_and_align.ipynb

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   "source": [
    "# Equation and align"
   ]
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    "Therefore, for line $i$, representing the $i^{th}$ gridblock, the value for the $i-1$ columnn of matrix $A$ should be\n",
    "\\begin{equation}\n",
    "A\\left[i \\right]\\left[i-1 \\right] = + \\frac{D\\theta}{\\Delta x}\\Delta y \\Delta z\n",
    "\\end{equation}\n",
    "\n",
    "The value representing the contribution from the cell on the right ($i+1$ column) is\n",
    "\\begin{equation}\n",
    "A\\left[i \\right]\\left[i+1 \\right] = + \\frac{D\\theta}{\\Delta x}\\Delta y \\Delta z\n",
    "\\end{equation}\n",
    "\n",
    "And the term on the diagonal is\n",
    "\\begin{equation}\n",
    "A\\left[i \\right]\\left[i\\right] = -2 \\frac{D\\theta}{\\Delta x}\\Delta y \\Delta z\n",
    "\\end{equation}"
   ]
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   "source": [
    "In 2-D the general stencils for an interior gridblock C in terms of total flux, specific flux and concentrations are:\n",
    "\n",
    "\\begin{equation}\n",
    "\\left(J_{EC}+J_{WC} + J_{NC}+J_{SC}\\right) = 0\n",
    "\\end{equation}\n",
    "\n",
    "\\begin{align}\n",
    "&\\left(j_{EC}+j_{WC}\\right) (\\Delta y) (\\Delta z) +\\left(j_{NC}+j_{SC}\\right) (\\Delta x) (\\Delta z)  = 0 \\label{eq7610}\n",
    "\\end{align}\n",
    "\n",
    "\n",
    "\\begin{align}\n",
    "&\\left(D\\theta {c_E - c_C \\over \\Delta x} +   D\\theta {c_W - c_C \\over \\Delta x}   \\right) (\\Delta y) (\\Delta z)\n",
    "+\\left(D\\theta {c_N - c_C \\over \\Delta y} +   D\\theta {c_S - c_C \\over \\Delta y}   \\right) (\\Delta x) (\\Delta z)= 0 \\label{eq7611}\n",
    "\\end{align}"
   ]
  }
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